Metal clinch pin



FIG. 1 is a top front perspective of a new design for a metal clinch pin;

FIG. 2 is a bottom front perspective thereof;

FIG. 3 is a right side elevation view, the left side being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in the drawings and all areas adjacent to the broken lines in the drawings illustrate portions of the metal clinch pin and form no part of the claimed design. 

CLAIM The ornamental design for a metal clinch pin, as shown and described. 